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How to use the isArray function from underscore

Find comprehensive JavaScript underscore.isArray code examples handpicked from public code repositorys.

underscore.isArray is a method used to determine if a given value is an array or not.

template-mixins.js

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function maxword(field) {
  const validation = field.validate || [];
  const mw = _.findWhere(validation, { type: 'maxword' });
  if (mw) {
    return _.isArray(mw.arguments) ? mw.arguments[0] : mw.arguments;
  }
  return null;
}

crud.js

GitHub: GeraldWodni/kern.js

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r.getCrud( req ).read( r.getRequestId( req ), function( err, data, fullData ) {
    if( err )
        return next( err );

    /* no matching dataset, render "add" */
    if( _.isArray( data ) ) {
        req.messages.push( { type: "danger", title: req.locales.__("Error"), text: req.locales.__( "Unknown ID" ) } );
        renderAll( req, res, next );
    }
    /* dataset found, render "edit" */

+ 5 other calls in file

How does underscore.isArray work?

underscore.isArray is a function in the Underscore.js library that determines if the given value is an array or not by checking its internal [[Class]] property. When called, underscore.isArray takes one argument, the value to check, and returns a boolean value of true if the value is an array and false otherwise. It works for arrays created in the same window or frame as the current context, as well as for arrays created in other windows or frames. The function first checks if the value is an object and then checks if its internal [[Class]] property is set to "Array".

leaflet-measure.js

GitHub: susanameono/Clase-9-correcta

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// Return the maximum element or (element-based computation).
// Can't optimize arrays of integers longer than 65,535 elements.
// See [WebKit Bug 80797](https://bugs.webkit.org/show_bug.cgi?id=80797)
_.max = function(obj, iterator, context) {
  if (!iterator && _.isArray(obj) && obj[0] === +obj[0] && obj.length < 65535) {
    return Math.max.apply(Math, obj);
  }
  if (!iterator && _.isEmpty(obj)) return -Infinity;
  var result = {computed : -Infinity, value: -Infinity};

+ 3 other calls in file

alexa.js

GitHub: joneslee0918/Chat-Extend-Node

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});


Alexa.out(function(message) {
  var server = this;
  var payload = _.isArray(message.payload) ? message.payload : [message.payload];
  return new Promise(function(resolve) {
    var response = message.originalMessage.getResponse();


    var alexaMessage = server.responseEnvelope();

Ai Example

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const _ = require("underscore");

const arr = [1, 2, 3];
const notArr = { a: 1, b: 2, c: 3 };

console.log(_.isArray(arr)); // true
console.log(_.isArray(notArr)); // false

In this example, the underscore library is used to check whether the arr variable is an array or not, which returns true. The notArr variable is an object, so _.isArray(notArr) returns false.

utils.js

GitHub: joneslee0918/Chat-Extend-Node

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case 'integer':
  validator = validators.integer;
  break;
case 'params':
    validator = value => {
      return _.isArray(value) && value.every(param => {
        return _.isObject(param) && !_.isEmpty(param.platform) && !_.isEmpty(param.name) && param.value != null;
      });
    };
  break;

+ 8 other calls in file

validator.js

GitHub: nishchaldv/avro-website

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    throw new InvalidSchemaError('validation not yet implemented: ' + JSON.stringify(schema));
  }
};

var _validateRecord = function(schema, obj) {
  if (!_.isObject(obj) || _.isArray(obj)) {
    throw new ValidationError('Expected record Javascript type to be non-array object, got ' + JSON.stringify(obj));
  }

  var schemaFieldNames = _.pluck(schema.fields, 'name').sort();

classifier.js

GitHub: ArVinD-005/RepoA

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  return _.map(obj, function(value){ return value[key]; });
};

// Return the maximum element or (element-based computation).
_.max = function(obj, iterator, context) {
  if (!iterator && _.isArray(obj)) return Math.max.apply(Math, obj);
  if (!iterator && _.isEmpty(obj)) return -Infinity;
  var result = {computed : -Infinity};
  each(obj, function(value, index, list) {
    var computed = iterator ? iterator.call(context, value, index, list) : value;

+ 20 other calls in file

schema-transformTo-table.js

GitHub: evan-org/yapi

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  key: key + "-" + index,
  desc: ConcatDesc(copiedState.title, copiedState.description),
  required: required.indexOf(name) != -1
};

if (value.type === "object" || (_.isUndefined(value.type) && _.isArray(optionForm))) {
  item = Object.assign({}, item, { type: "object", children: optionForm });
  delete item.sub;
} else {
  item = Object.assign({}, item, optionForm);

+ 7 other calls in file

markdown.js

GitHub: cloakscn/yapi-docker

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//  按照columns的顺序排列数据
let tpl = ``;
dataSource.map(col => {
  let child = null;
  tpl += `<tr key=${col.key}>${tableCol(col, columns, level)}</tr>`;
  if (!_.isUndefined(col.children) && _.isArray(col.children)) {
    let index = level + 1;
    child = tableBody(col.children, columns, index);
  }
  tpl += child ? `${child}` : ``;

schema-transformTo-table.js

GitHub: cloakscn/yapi-docker

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  key: key + '-' + index,
  desc: ConcatDesc(copiedState.title, copiedState.description),
  required: required.indexOf(name) != -1
};

if (value.type === 'object' || (_.isUndefined(value.type) && _.isArray(optionForm))) {
  item = Object.assign({}, item, { type: 'object', children: optionForm });
  delete item.sub;
} else {
  item = Object.assign({}, item, optionForm);

cardDataView.js

GitHub: jskopek/shellviz-homepage

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    this.current = 0;
    this.searchQuery = undefined;
}
render() {
    var filteredData = this.filteredData();
    var dictVal = _.isArray(filteredData) ? filteredData[this.current] : filteredData;

    $(this.el).html(cardDataViewTemplate({
        values: _.pairs(dictVal),
        searchQuery: this.searchQuery,

aldeed_collection2-core.js

GitHub: NadeemBeg/shopSkip-liquor_app

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* @category Lang
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is an array, else `false`.
* @example
*
* _.isArray([1, 2, 3]);
* // => true
*
* _.isArray(document.body.children);
* // => false

+ 17 other calls in file

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