Javascript iterate an array with two conditions

Question

I have this array and these values:

const levels = [
    {
       name: 'first level primary school'     
    }, 
    {
       name: 'second level primary school'     
    },
    {
      name: 'first level secondary school'     
    }
]

const isPrimarySchool = false
const isSecondarySchool = false

And I want to iterate the array and find if there is a string with the word 'primary' or 'secondary' and turn the value of isPrimarySchool or isSecondarySchool to true.

The method that I found to resolve this, is this one:

levels.forEach(level => {
            if (
              level.name.toLowerCase().includes('primary')
            ) {
              isPrimarySchool = true
            }
            if (
              level.name.toLowerCase().includes('secondary')
            ) {
              this.isSecondarySchool = true
            }
          })

Is there a better way to resolve this, using lodash or normal javascript?

you can not reassign to a const. what result do you expect? — Nina Scholz
– Nina Scholz, Commented Jan 19, 2022 at 21:11

Nina Scholz · Accepted Answer · 2022-01-19 21:14:45Z

3

You could take a function for using with Array#some and hand over the expected value.

const
    has = string => o => o.name.includes(string),
    levels = [{ name: 'first level primary school' }, { name: 'second level primary school' }, { name: 'first level secondary school' }],
    isPrimarySchool = levels.some(has('primary')),
    isSecondarySchool = levels.some(has('second'))
    
console.log(isPrimarySchool);
console.log(isSecondarySchool);

answered Jan 19, 2022 at 21:14

Nina Scholz

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1 Comment

Kobe Over a year ago

nice usage of function currying!

TAHER El Mehdi · Accepted Answer · 2022-01-19 21:13:47Z

2

I want to iterate the array and find if there is a string with the word 'primary' or 'secondary' and turn the value of isPrimarySchool or isSecondarySchool to true.

Using some() with includes

const levels = [
    {
       name: 'first level primary school'     
    }, 
    {
       name: 'second level primary school'     
    },
    {
      name: 'first level secondary school'     
    }
]
const isPrimarySchool = levels.some(x=>x.name.toLowerCase().includes('primary'))
const isSecondarySchool = levels.some(x=>x.name.toLowerCase().includes('secondary'))
console.log({isPrimarySchool,isSecondarySchool})

answered Jan 19, 2022 at 21:13

TAHER El Mehdi

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Comments

Michele Da Rin · Accepted Answer · 2022-01-19 21:14:49Z

1

You could use the built-in Array.some() function and some regexp:

isPrimarySchool = levels.some(level => /primary/.exec(level.name));
isSecondarySchool = levels.some(level => /secondary/.exec(level.name));

answered Jan 19, 2022 at 21:14

Michele Da Rin

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